DE69930018T2 - Contact for electrical component - Google Patents

Abstract

The present invention refers to a method of securing an electrical component (1) to a substrate (S), comprising the steps of: providing an electrical component (1) having a plurality of conductive elements (3) extending therefrom; providing a cassette (13); inserting said electrical component (1) into said cassette (13); providing a substrate (S); providing a housing with a plurality of contacts (100) thereon corresponding to said conductive elements (3); mounting said housing to said substrate (S); connecting a portion of said conductive elements (3) of said component with a portion of said contacts (100); and connecting the remainder of said conductive elements (3) of said component (1) with the remainder of said contacts (100).

Description

Background of the invention

1. Field of the invention

The The present invention relates to electrical connectors. Especially For example, the present invention relates to an electrical contact for an electrical Component.

2. Description of the state of the technique

electrical Circuits, such as integrated circuit (IC) chips, must be on attached to a substrate. An example of a connection system for Attachment of such contact arrangement (PGA) components to one Substrate is a zero insertion force (ZIF) system. For ZIF systems penetrate pins of the PGA component into an interconnect housing, without intervening in contacts of the interconnect, the attached to the substrate. Only after the PGA component on the interconnect housing sits, the contacts and the contact pins are engaged.

One Procedure for the engagement of the contacts and the PGA pins involves the movement the PGA pins sideways and in engagement with the contacts. An actuating lever and a knobbed surface drive an intermediate arrangement laterally to move the PGA pins forward. The intermediate assembly moves the PGA pins to the contacts and connect them with these.

The Casing, that for such ZIF connections is used, is subject to and after the lever operation Charges. The forces, the for the bending of the contacts needed be to the PGA pins determine the amount of load on the housing. ever greater the number the contacts, the more the maximum or maximum force, which is necessary to connect the contacts and the PGA pins connect. Estimated is for a connection with 500 contacts a force of 9,072 kg (20 pounds) Applied to the contacts and the PGA pins successfully connect to.

The EP 0 806 813 A2 describes another technology in which the contact arms of a female contact can bend away to receive a contact pin. The two contact arms are laterally spaced from each other and when the pin is inserted, the two arms bend. In order to limit such bending, an area of the arm is offset from the contact plane and an area with strong restraining forces. However, this design increases the distance between the holes of the housing.

Of the Technological advancement has the contact pin number and the contact density the PGA components increased and has computer components reduced (which required reduced profile sizes). While the improved speed is good for the consumer, burden These technological advances are conventional ZIF sockets. Often, a buildup which compensates for any of the above technological advances Structure that compensates for another technological advance.

at an example of a change a manufacturer can determine the number of holes and the distance between the holes reduce the increased pin density and pin size to consider. However, this reduces the strength the socket.

In another change example a manufacturer can shorten the contact to take account of the reduced profile size. A shorter contact but has a greater stiffness, whereby the needed insertion force for the Connection to the PGA pins elevated becomes.

These Both manufacturing objectives have conflicting needs because a stiffer contact has a higher actuation force on the lever necessary. A greater operating force reinforced the load on the socket. However, the diminished strength of the Socket (by the larger hole size and the decreased distance) to make the socket less likely the amplified Withstand stress. The larger contact density also influences the possibilities the usual Contact formation process. The typical process for forming two opposed Contact leg consists of punching the contact out of one Location of material. However, that exceeds Width of the material layer leading to the formation of a single contact with conventional Techniques necessary is the spacing requirements that stand out these advanced technologies result.

Summary the invention

A Object of the present invention is to provide a Connector having an electrical component with a substrate combines.

A Another object of the present invention is the provision a connector for the Connecting an electrical component to a substrate, the a lower maximum insertion force having.

A Another object of the present invention is to provide a Specify contact with two aligned contact arms.

These and other objects of the invention are achieved by a contact according to claim 1 solved. The contact has a retention area, a back area and a pair of arms. The retention area is opposite Ends on and defines a plane. The rear area extends from one end of the retention area out. The pair of arms extends from the other end of the retention area out. Each arm of the arm pair has a first and a second Area. The first area moves the arm out of the level of the retention area out, with each arm in opposite sides of the plane of the retention area lies. The second area extends from the first area and has bent over it. The second area has a mutual contact area. The mutual contact areas of the two arms work together to intervene to get in touch.

Summary the figures

Other Uses and advantages of the present invention will become apparent for the One skilled in the art from the following description with reference to the Drawing in which show:

1a a perspective view of an embodiment of a connector according to the invention in a connected state;

1b the connector according to 1a in unconnected condition;

2a a perspective view of a portion of the in 1a and 1b shown connector before receiving an electrical component;

2 B another perspective view of the in 1a shown connector;

3a an enlarged view of the area of the connector, in the dashed line of 2 B lies;

3b a cross-sectional view of the portion of the connector, in 3a taken along the line IIIB-IIIB;

3c an alternative arrangement of the area of in 3a shown connector;

3d a cross-sectional view of the area of in 3c shown connector along the line IIID-IIID;

4a a perspective view of another embodiment of the in the 1a and 1b shown connector;

4b a cross-sectional view of the area of in 4a shown connector along the lines IVB-IVB;

4c a cross-sectional view of the area of the connector in 4b with the contacts inserted therein;

5 a cross-sectional view of a portion of the connector along the line VV of 1b ;

6 a perspective view of an alternative embodiment of a contact according to the invention;

7 a front view of the contact according to 6 before assembly;

8th a side view of the in 6 shown contact during assembly; and

9 a front view of the in 6 shown contact.

detailed Description of the Preferred Embodiments

An electrical connector 10 connects an electrical component 1 with a substrate S (see 5 ). As in 2a shown, the electrical component 1 a PGA component, such as an IC chip, however, other types of electrical components may be used, such as a multi-chip module (MCM). The component 1 has a plurality of conductive elements, such as the contact pins 3 that protrude from the component. The contact pins 3 are arranged in a grid of rows and columns. Although the conductive elements are shown as round contact pins, other types of conductive elements, including fins (not shown), may be used.

The connector 10 has two connectable parts, a cassette 11 and a housing 13 , 1a shows the cassette 11 and the case 13 in a connected state while 1b shows the disconnected state. The cassette 11 and the case 13 will now be described in detail.

The 2a and 2 B show a cassette 11 which is preferably made of a suitable plastic such as a liquid crystal polymer (LCP). The cassette 11 can be a base 15 which is described throughout as a plate containing the component 1 receives. However, other arrangements are possible to different types of electrical components 1 to arrange.

Through the base 16 at least one opening extends 17 , In the in the 2a and 2 B illustrated embodiments has the basis 15 several openings 17 on. The openings 17 are on the base plate 15 arranged to corresponding pins 3 the electrical component 1 take. Thus, the arrangement of the openings 17 on the base 15 through the locations of the contact pins 3 on the electrical component 1 certainly.

As in the 3a and 3b shown, the openings can 17 have conical introductions to when inserting the contact pins 3 to help. When the electrical component 1 right on the cassette 11 is positioned, the contact pins extend 3 over the lower surface of the base plate 15 out, as it is in 1b is shown.

The base plate 15 can a wall 19 have, which extends at its outer periphery. As in the embodiment of 2 B shown, the wall extends 19 below the surface of the base plate 15 , for example, to contact pins 3 to protect against damage.

Preferably along the sides extend from the base plate 15 locks 21 , The locks 21 have a flange portion (see 2a ), which is generally perpendicular to the base plate 15 projects. The distal ends of the flange portions have a mounting portion 23 on, which extends from the flange portion. The area between the attachment area 23 and the upper surface of the base plate 15 takes the electrical component 1 on.

When introducing the contact pins 3 the electrical component 1 in the openings 17 , bends the electrical component 1 the flexible locks 21 outward. When the electrical component 1 completely on the cassette 11 sits, sweep the sections 23 back to their original, non-bent position and engage in the upper surface of the electrical component 1 a, like in 1b shown. The attachment sections 23 prevent the electrical component 1 unpredictable from the cassette 11 solves. The electrical component 1 can from the cassette 11 be detached by the attachment areas 23 from the upper surface of the electrical component 1 be solved. When the electrical component 1 right in the cassette 11 sits, can the electrical component 1 with the contacts 100 get connected. The cassette 11 rotates relative to the housing 13 so that only a limited number of contact pins 3 at a time with the contacts 100 come in contact. The cassette 11 rotates relative to the housing 13 , so that successively the columns of the contact pins 3 with successive columns of contacts 100 get connected. The wall 19 has an approach 25 on the leading edge of the base plate 15 on to the operator during the rotation of the cassette 11 to be helpful. The connection of the contact pins 3 with the contacts 100 will be described in more detail below.

The wall 19 has a hinge arrangement 27 at the trailing edge of the base plate 15 on. The joint arrangement 27 allows in conjunction with the hinge assembly on the housing, the rotation of the cassette 11 relative to the housing 13 and represents the correct arrangement of the contacts 3 the electrical component 1 with the contacts 100 of the housing 13 secure during the connection process. The joint arrangement 27 extends generally parallel to the plane of the cassette 11 , A description of the components of the hinge assembly 27 follows.

From the trailing edge of the cassette 11 stand extensions 29 outwards, preferably on opposite sides of the trailing edge. Every extension 29 has a curved element 31 on top of a pair of arms 33 flanked. The curved elements 31 have a first surface 67 on, which is shaped so that a hinge pin on the housing 13 can engage, as well as a second surface 69 opposite the first surface 67 that is shaped to fit with a block 65 on the case 13 interacts.

Every outermost arm 33 has an outward-facing or outer surface 35 on that with the corresponding surface on the hinge assembly of the housing 13 cooperates to ensure the correct lateral arrangement of the contact pins on the electrical component 1 and the contacts on the housing 13 to ensure the connection.

From the rear edge of the case 13 is another extension 39 outward. The extension 39 preferably extends from a central location along the trailing edge of the housing 13 between the extensions 29 but it runs counter to the direction to the extensions 29 , The middle extension 39 has a curved element 71 on, from two arms 73 flanked. The curved elements 71 have a first surface 75 which is shaped so that it engages around a hinge pin on the housing and a second surface 77 opposite the first surface 75 for interaction with the block 65 on the case 13 is trained.

The 3a and 3b show a down cut the bottom surface of the base plate 15 , In this arrangement, the contact pins 3 the electrical component 1 free from the openings 17 protrude and survive over the bottom plate of the base plate. The base plate 15 forms a lateral support for the areas of the contact pins 3 that are inside the plate 15 lie. However, the distal ends of the contact pins 3 (ie, the areas of the contact pins) that extend beyond the lower surface of the base plate 15 survive, not supported on the side.

The 3c and 3d show an alternative arrangement in which the base plate 15 ' laterally the pins 3 ' supports over a greater length than in the other embodiment. The 3c and 3d specifically show an alternative arrangement of the lower surface of the base plate 15 ' , the bridges 79 ' that is between each opening 17 ' are arranged. The bridge 79 ' can be curved sides 81 ' and recessed ends 83 ' exhibit.

The recessed ends 83 ' correspond to the shape of the contact pins 3 ' , As in 3c shown have the recessed ends 83 ' and the electrical component 1 round contact pins 3 ' used a round concave shape for receiving a portion of the contact pin 3 ' , The bridges 79 ' are so on the base plate 15 ' arranged that they are not with the contacts 100 ' interfere. As in 3c shown are the thighs 101 ' every contact 100 ' arranged in a column while the bridges 79 ' arranged in rows. Thus, the presence of the bridges influences 79 ' the bending of the thighs 101 ' Not. The bridges 79 ' Can be integral with the base plate 15 ' be shaped.

The 4a to 4c show the case 13 , which is preferably made of a suitable plastic material. The housing 13 has a base 41 with several openings 43 through the base. Like the base 15 can the base 41 have a generally flat configuration, but other orientations are possible.

Every opening 43 preferably has three sections. The first paragraph 45 is a relatively wide opening to the bend of the two legs 101 of the contact 100 to join in the connection. The second section 47 takes the end section 103 of the contact 100 and a portion of a fusible element as described below 105 , The third section 49 finally takes the intermediate section 107 of the contact 100 in the opening 43 on.

As in 4b shown is the leg receiving portion 45 at the attachment end of the housing 13 and has conical sidewalls 41 that make an introduction. The conical sidewalls 51 allow easy introduction of contacts 100 in the opening 43 and allow the legs to bend 101 through the contact pins 3 without restriction.

The end receiving section 47 lies at the attachment end of the housing 13 , Because the case 13 is mounted on the substrate S on the surface, preferably using the Ball Grid Array (BGA) technology, the end receiving portion 47 have a suitable shape to accommodate the BGA features. In one example of BGA technology, a fusible element, such as a solder ball, becomes 105 at the end section 103 of the contact 100 attached. At least a portion of the solder ball 105 at one end 103 of contact 100 fixed in the end receiving section 47 the recording 43 lie. International Patent Application Publication No. WO 98/15989 (International Application No. PCT / US97 / 10866) describes a method of attaching a solder ball to a contact and attaching a solder ball to a substrate.

The intermediate section 49 extends between the leg receiving portion 45 and the end receiving portion 47 , Opposite walls of the intermediate section 49 each have a lead 43 on, which are aligned with each other. As in 4b shown, the lead can 53 a rib that extends axially along the opening 43 extends. The distance between the opposite walls of the intermediate area 49 exceeds the width of the contact 100 to make sure the contact 100 the opening 43 happens. However, the width of the contact exceeds 100 the distance between the opposing protrusions 53 , The result is the contact 100 in an interference fit between the protrusions 53 for fixing in the opening 43 ,

The base plate 41 can also be a wall 55 along its outer edge. Similar to the wall 19 the cassette 11 the wall extends 55 from the plate 41 and protects the contacts 100 from damage. If the cassette 11 and the case 13 connected to each other, lies the wall 19 the cassette 11 between the wall 55 and the contacts 100 , As in 4a seen, the leading edge of the wall 15 a notch 57 for the extension 25 the cassette 11 on when the connector 10 is plugged together. This allows a complete rotation of the cassette 11 relative to the housing 13 , so all the pins 3 and contacts 100 be connected to each other. To coincide with the joint arrangements 27 . 59 to prevent is the wall 55 in the area of the rear edge of the base 41 interrupted.

The back edge of the base plate 41 has a hinge arrangement 59 on that with the hinge assembly 27 the cassette 11 interacts and the rotation of the cassette 11 relative to the housing 13 allows. The joint arrangement 59 extends generally parallel to the plane of the housing 13 and has a hinge pin 61 on that by a series of straps 63 along the trailing edge of the housing 13 is anchored.

A series of cams or blocks 65 extends from the trailing edge between adjacent carriers 63 , The blocks 65 have curved surfaces 75 that the second surfaces 69 . 77 the extension 33 and the middle extension 35 correspond. The curved surfaces 75 of the blocks 65 may be round and preferably have substantially the same radius of curvature as the second curved surfaces 69 . 77 the extensions 33 and the middle extension 35 , This can be the correct longitudinal arrangement and the arrangement to the Z-axis (ie perpendicular to the plane of the housing 13 ) of the contact pins 3 the electrical component 1 and the contacts 100 in the housing to ensure connection.

Every ultimate bearer 63 has an inward or inner surface 85 on that with the surfaces 35 the joint arrangement 27 interacts to ensure the correct arrangement of the contact pins 3 the electrical component E and the contacts 100 to ensure the connection. The area 35 the cassette 11 more precisely, lie on the surfaces 85 of the housing 13 on to the cassette 11 and the case 13 laterally for the connection pins 3 and the contacts 100 align.

Connecting the cassette 11 and the housing 13 is described below. First, the cassette 11 and the case 13 disconnected or disconnected. In this condition, the housing can 13 be attached to a substrate S. As explained above, the housing 13 surface-mounted on the substrate S, preferably using the BGA technology. Likewise, other methods may be used. The following is the electrical component 1 on the cassette 11 attached. In the embodiment described above, the contact pins get 3 the electrical component 1 in the openings 17 until the lock 21 the electrical component 1 on the cassette 11 holds.

To connect the cassette 11 with the housing 13 need the joint arrangements 27 . 59 like in the 1b and 5 shown, meshed. The features of the joint arrangement 27 . 59 the cassette 11 and the housing 13 improve the simplified blind meeting of the cassette 11 and the housing 13 ,

Describing the connection more exactly, so grab the extensions 29 and the middle extension 39 in the openings between the hinge pin 61 , the carriers 63 and the trailing edge of the housing are formed. The introduction takes place in the direction indicated by the arrow A in 5a is shown. The poor 33 . 73 the joint arrangement 27 come in the areas that the blocks 65 the joint arrangement 59 flank. The outer surfaces 35 the poor 33 lie on the surfaces 85 the holder 63 on. The interaction of the outer surfaces 35 with the inner surfaces 85 align the pins 3 and the contacts 100 laterally along an axis parallel to the trailing edge of the cassette 11 and the housing 13 out.

In connected, open state, as in 1b shown, the surfaces begin 75 of the block 65 on the two surfaces 69 . 77 the extensions 29 and the middle extension when the cassette 11 in the direction of arrow B of 5 is rotated. The surfaces 68 . 75 . 77 help with the cassette 11 and the recording 13 along an axis parallel to the sides of the cassette 11 and the housing 13 align. Preferably, the other adjacent surfaces of the arms 33 , the bracket 63 and the blocks 65 in between a game, for the rotation of the cassette 11 to reduce the required force.

The extension 29 and the middle extension 39 allow due to the opposing arrangement of the middle element 39 relative to the extensions 29 a restraining force on opposite sides of the hinge pin 61 , as in 5 is shown. The retention forces prevent together with the arrangement of the extensions 29 and the middle extension 39 between the hinge pin 61 and the housing 13 the separation of the cassette 11 from the case 13 , In other words, the cassette 11 only from the case 13 be disconnected when the connection process is undone (ie by turning the cassette 11 away from the case 13 ).

By turning the cassette 11 relative to the housing 13 becomes the connection of the contact pins 3 the electrical component 1 and the contacts 100 in the case 13 began. As in 5 it can be seen, meet the columns of the pins 3 and the contacts 100 closest to the trailing edge of the cassette 11 and the housing 13 are arranged first. The connection is made with each successive column away from the trailing edge of the cassette 11 and the housing 13 continued. The consecutive connection of the contact pins 3 and the contacts 100 reduces peak insertion force compared to ZIF jacks.

The column of contact pins 3 and the Kon contacts 100 closest to the trailing edges of the cassette 11 lie, connect first. The connection is made with each successive column away from the trailing edges of the cassette 11 and the housing 13 continued.

The rotation of the cassette 11 starts the connection of the contact pins 3 and the contacts 100 , Every contact pin 3 During the rotation, gradually comes into the space between the opposite arms of the two-legged contacts. The two legs hold the contact pin 3 firmly. The area between the two legs is generally parallel to the axis of connection of the cassette 11 and the housing 13 oriented.

1a shows the connector 10 in fully connected and closed state. When connecting the wall surrounds 55 of the housing 13 the cassette 11 , and the lead 25 can in the incision 57 in the leading edge of the housing 13 penetration.

Although the connector 10 Any type of contact can be followed by a detailed discussion of a preferred contact 100 , How to get in 6 recognizes, is the contact 100 a contact with two aligned arms. The contact 100 has a middle range 107 on that between the pair of arms 101 lies and a rear area 103 , Preferably, the middle region 107 essentially just. When mounting in the housing 13 touches the middle area 107 projections 53 and sits in a press fit in the openings 43 the base plate 41 , This retention feature is also described in the above-mentioned International Patent Application WO 98/15989.

Every arm 101 has a curved area 109 up, extending from the middle area 107 extends out. As in 8th shown, lift the curved areas 109 the poor 101 from the plane of the middle area 107 out. Every curved area 109 lies in opposite sides of the plane of the middle area 107 , This allows a spatial separation between the poor 101 to the pen 3 to take up between themselves.

The arm area 111 extends from the distal end of the bent portion 109 , The distal ends of the arm areas 111 include an inwardly bent area 113 and introductions 115 , As in the 6 and 8th to see the curved areas converge 113 to the level of the middle range 107 to. The distance between opposing inward curved areas 113 (how to get in 8th sees) is smaller than the thickness of the pins 3 , That is, the pins 3 need the arms 101 separate when they are introduced. The elasticity of the arms 101 when spreading apart through the pins 3 creates a good surface contact between the contacts 100 and the pins 3 and generates sufficient transverse contact forces of the arms 101 against the sides of the pins 3 ,

As in 9 recognizing is every arm area 111 angled with respect to the longitudinal axis. The specific angle depends on the size and shape of the contact 100 from. The orientation of the arm areas 111 orients the inward curved areas 113 alignment. That is, the inward curved areas 113 create between them a pin receiving gap, the arms 101 the opposite side of the pins 3 attack in aligned position. In other words, the inwardly bent portions are substantially along a central longitudinal line of the contact 100 arranged as in 9 you can see.

More specifically, the arm portions extend 111 with angles α1, α2 with respect to the longitudinal axis of the contact 100 between about 5 ° to 20 ° with a typical sized contact. Most preferably, the α1, α2 are about 12.5 ° for a typical sized contact. Although the arms 111 are angled relative to the longitudinal axis, shows 8th that the arms 111 preferably substantially parallel to the plane of the middle region 107 stay organized. The poor 111 however, they may be angled away from the plane of the central region by up to about 10 ° (not shown).

The introduction areas 115 extend from the inward curved areas 113 in a direction away from the plane of the middle area 107 , The introduction areas 115 help the pins 3 with inward curved areas 113 during the plugging process.

The following is a method of making the contact 100 described. A sheet metal material is punched to form a carrier strip 119 of the contact 100 to produce, as in 7 shown. The distance between adjacent contacts 100 on the carrier strip 119 is equal to the distance of the contacts in the housing 13 , At this time is the contact 100 still in flat form.

A shaping step bends the arms 101 from the plane of the middle area 107 , creates inward curved areas 113 and represents the insertion area 115 here, as in 8th shown. The shaping steps are conventional and require no further discussion.

The last step kicks the arms 111 with respect to the longitudinal axis of the contact 100 , as in 9 you can see. Although there are many methods for edging the arms 111 with respect to the longitudinal axis, the preferred method is any known stamping method The punching step forms a deformed area 117 on the outer edge of the opposite arms 101 , More specifically, the stamping process removes part of the material from the area 117 , The punched out quantity controls the canting of the arms 110 with respect to the longitudinal axis of the contact 100 , The punching step allows the formation of the aligned arm pair contact, which meets the requirements for the contact spacing of the technology advances mentioned above. After punching the arms 101 may be the contact from the carrier strip 119 for insertion into the housing 13 be separated. The present invention allows the contacts 100 longer on the carrier strip 119 during the contact forming process than in conventional techniques. By staying longer on the contact strip 119 The molding process of the present invention is better suited to automated or semi-automated techniques.

Even though the present invention in connection with preferred embodiments described in the various figures, it is obvious that similar other embodiments can be used or that changes and accessories to the described embodiment can be done to perform the same function as the present invention, without to refuse. Consequently, the present invention should not to a single embodiment be limited rather, it should be within the scope of the following claims.

Claims (9)

Electric contact ( 100 ) with: a retention area ( 107 ) for engaging in a wall of an opening ( 43 ) in a connector housing ( 13 ), wherein the retaining region has opposite ends and defines a plane, a rear region (FIG. 103 ) extending from one of the opposite ends and a pair of arms ( 101 ) extending from the other of the opposite ends, each arm pair ( 101 ): a first area ( 109 ), the arm from the level of the retention area ( 107 ), each of the pairs of arms ( 101 ) on opposite sides of the plane of the retention area ( 107 ), characterized in that each of the pairs of arms further comprises a second region ( 111 ) obliquely with respect to the first region ( 109 ), the second area ( 111 ) a contact area ( 113 ) and wherein the contact areas ( 113 ) of the pair of arms ( 101 ) a contact ( 3 ) receive an electrical component between them. An electrical contact according to claim 1, wherein the second region ( 111 ) further comprises a deformed region ( 117 ) having. An electrical contact according to claim 2, wherein said second regions ( 111 ) each have a surface which is opposite to the second region ( 111 ), the deformed region ( 117 ) is disposed on the opposite surfaces. An electrical contact according to claim 3, wherein the deformed Area is an area of reduced thickness. An electrical contact according to claim 4, wherein the region of reduced thickness ( 117 ) is embossed. An electrical contact according to claim 1, wherein the contact has a longitudinal axis, the first regions ( 109 ) of the pair of arms ( 101 ) are offset on opposite sides of the longitudinal axis, and the second regions ( 111 ) of the pair of arms ( 101 ) are angled relative to the longitudinal axis. An electrical contact according to claim 6, wherein the contact areas ( 113 ) of the pairs of arms ( 101 ) intersect the longitudinal axis. An electrical contact according to claim 1, wherein the contact areas ( 113 ) the poor ( 101 ) each define a plane, the planes of the contact areas ( 113 ) between about 0 ° and 10 ° with respect to this plane of the retention area ( 107 ) are angled. An electrical contact according to claim 8, wherein the planes of the contact areas ( 113 ) substantially parallel to the plane of the retention area ( 107 ).